Ruthenium(III)_bromide

Ruthenium(III) bromide

Ruthenium(III) bromide

Chemical compound

Ruthenium(III) bromide is a chemical compound of ruthenium and bromine with the formula RuBr3. It is a dark brown solid that decomposes above 400 °C.[2]

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Preparation

Ruthenium(III) bromide can be prepared by the reaction of ruthenium metal with bromine at high temperature and pressure (720 K and 20 bar):[3]

2 Ru + 3 Br2 → 2 RuBr3

Structure

The crystal structures of ruthenium(III) bromide contain parallel (RuBr3)∞ columns. The compound undergoes a phase transition around 384 K (111 °C) from an ordered orthorhombic structure in space group Pnmm with alternating long and short Ru-Ru distances to a disordered hexagonal TiI3-like structure in space group P63/mcm with (on average) equal Ru-Ru distances.[1] In the disordered polymorph, the Ru-Ru distances are not believed to actually be equal but appear so due to a random distribution of two distinct column conformations. Both polymorphs consist of hexagonally close-packed bromide ions.[4]

References

  1. [1]
    Hillebrecht, H.; Ludwig, T.; Thiele, G. (2004). "About Trihalides with TiI3 Chain Structure: Proof of Pair Forming of Cations in β-RuCl3 and RuBr3 by Temperature Dependent Single Crystal X-ray Analyses". Zeitschrift für Anorganische und Allgemeine Chemie. 630 (13–14): 2199–2204. doi:10.1002/zaac.200400106.
  2. [2]
    Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 1082-1084. ISBN 978-0-08-037941-8.
  3. [3]
    Housecroft, C. E.; Sharpe, A. G. (2008). Inorganic Chemistry (3rd ed.). Prentice Hall. p. 779. ISBN 978-0-13-175553-6.
  4. [4]
    Merlino, S.; Labella, L.; Marchetti, F.; Toscani, S. (2004). "Order−Disorder Transformation in RuBr3 and MoBr3: A Two-Dimensional Ising Model". Chem. Mater. 16 (20): 3895–3903. doi:10.1021/cm049235q.
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